Authors S.A. Corey tell Polygon that they came to prepared for a six-season arc. But will there be a season 7? Maybe not of the show now, but company Alcon is "committed" to the IP and there could still be more Expanse in the future, according to the writers. Here’s what they said during a season 6 interview.
If after finishing the Expanse TV series I read the last books in the series that were not covered, will they make sense or the adaptation diverged too much? - Quora
WHY IS THIS CANCELLED : r/TheExpanse
WHY IS THIS CANCELLED : r/TheExpanse
Expanse Season 6 Was Always The End, Says Book Author
In the End, 'The Expanse' Broke the Wheel - The Ringer
What is 'The Expanse' series on Netflix like? Is it worth watching for a science fiction fan who has never read the books before, and why? - Quora
Why The Expanse Ended With Season 6 And Whether There Will Be More
Tiamat's Wrath (The Expanse, 8): 9780316332897: Corey, James S. A.: Books
Tiamat's Wrath (The Expanse Book 8) eBook : Corey, James S. A.: Kindle Store